Portion of a clock



FIG. 1 is a perspective view of a portion of a clock showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view; and,

FIG. 5 is a left side elevational view thereof.

The phantom lines showing features of a clock in FIGS. 1-5 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portion of a clock, as shown and described. 